AlwaysOn Availability Groups concepts

https://blogs.msdn.microsoft.com/psssql/2013/04/22/how-it-works-always-onwhen-is-my-secondary-failover-ready/

https://www.brentozar.com/archive/2015/09/synchronous-alwayson-availability-groups-is-not-zero-data-loss/

https://www.brentozar.com/sql/sql-server-alwayson-availability-groups/

https://www.brentozar.com/archive/2016/09/asynchronous-database-mirroring-vs-asynchronous-availability-groups/

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